MLA

Stevenson, Robert Louis, 1850-1894. South Seas. Robert Louis Stevenson drafts of the South Seas, 1889-1891.. Box 1 | Folder 2. [ca. 1889-1891]. https://collections.library.yale.edu/catalog/10269885.

APA, 6th edition

Stevenson, Robert Louis, 1850-1894. South Seas. (["Box 1 | Folder 2"])([ca. 1889-1891])[Robert Louis Stevenson drafts of the South Seas, 1889-1891.]. https://collections.library.yale.edu/catalog/10269885.